【最新版可复制文字】JEDECJESD305-R4-RCB_v1.02022DDR5RDIMM资源-CSDN文库

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DDR5 RDIMM是新一代内存模块的规范，由JEDEC固态技术协会（JEDEC Solid State Technology Association）制定。JESD305-R4-RCB_v1.0是这个标准的一个修订版本，发布于2022年4月。JEDEC是一个全球性的组织，致力于制定电子组件的标准，以促进互换性、改进产品并消除制造商与购买者之间的误解。 DDR5（Double Data Rate 5）内存相较于其前代DDR4，在性能、能效和可靠性方面都有显著提升。它引入了诸多新特性，旨在满足数据中心、高性能计算和服务器平台对高速内存的需求。以下是一些DDR5 RDIMM的关键知识点： 1. **更高的带宽**：DDR5内存的初始速度就比DDR4快，提供更高的数据传输速率，如DDR5-4800起步，远高于DDR4的初始速度（DDR4-2133）。随着技术的发展，DDR5的频率可以进一步提高，以支持更密集的数据处理任务。 2. **更大的容量**：DDR5内存条支持更高的单芯片密度，使得单个RDIMM模块可以拥有更大的存储容量，减少了对内存插槽的需求，有助于提高系统扩展性和降低功耗。 3. **通道分离**：DDR5将数据通道分成了两个独立的32位子通道，每个通道都可以独立操作，这提高了数据传输的效率和系统的并发能力。 4. **电压和功耗管理**：DDR5引入了集成电压调节器（IVR），内置在内存模块上，减少了主板上的电源管理复杂性，同时降低了整体系统功耗。 5. **增强的错误校正**：DDR5采用增强型ECC（Error Correction Code），提供更强大的数据保护，确保数据传输的准确性，尤其在大数据和高可靠性应用中至关重要。 6. **增强的热管理**：DDR5模块可能包含更高级的热传感器和热管理机制，以确保在高负荷工作条件下保持稳定运行。 7. **预充电时间减少**：DDR5降低了预充电时间，提高了内存的周期时间，从而实现更快的响应速度。 8. **Bank Groups**：DDR5增加了Bank Group的数量，允许内存模块在不同Bank Group之间并行操作，提高了内存访问的效率。 9. **On-Die Termination (ODT)**：DDR5内存使用片内终结技术，优化信号完整性，减少信号干扰，进一步提升性能。 10. **Power Management Interface (PMI)**：新的PMI提供了更精细的电源管理功能，支持动态电压和频率调整，帮助系统在性能和能效之间找到平衡。这些技术改进和设计优化使得DDR5 RDIMM成为服务器、数据中心和高性能计算应用的理想选择。遵循JEDEC JESD305-R4-RCB标准，内存制造商可以确保其产品符合行业统一的技术要求，为用户提供兼容性强、性能卓越的内存解决方案。

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JEDEC

STANDARD

DDR5 RDIMM Standard Annex B

JESD305-R4-RCB

Version 1.0

APRIL 2022

JEDEC SOLID STATE TECHNOLOGY ASSOCIATION

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JEDEC

JEDEC Standard No. 305-R4-RCB

Version 1.0

-i-

DDR5 RDIMM STANDARD ANNEX B

Contents

Page

1 Scope ................................................................................................................................................. 1

2 DDR5 Registered DIMM Design File .............................................................................................. 1

3 Module Configuration ....................................................................................................................... 1

4 SDRAM Configuration ..................................................................................................................... 2

5 Supported Speeds .............................................................................................................................. 2

6 Design Deviations ............................................................................................................................. 2

7 General Layout .................................................................................................................................. 3

8 Functional Block Diagram ................................................................................................................ 4

9 SMBus Net Structures ....................................................................................................................... 8

10 Clock Input Net Structure ................................................................................................................. 8

11 Register Clock Output Net Structure ................................................................................................ 9

12 Data Net Structure – DQ, CB, DQS_t, DQS_c ............................................................................... 11

13 Post Register Address and Command Net Structure Routing ......................................................... 13

14 Post Register Control Net Structure Routing .................................................................................. 14

15 Pre-Register Address, Command’ and Parity Net Structure Routing .............................................. 15

16 DIMM Impedance Profile ............................................................................................................... 16

17 ALERT_n Output Net Structure Routing ........................................................................................ 17

18 DERROR_in_n Net Structure Routing ........................................................................................... 17

19 RESET_n and QRST_n Net Structure Routing .............................................................................. 18

20 Function Control Word Programming ............................................................................................. 19

21 Cross Section Recommendations .................................................................................................... 20

Tables

Table 1 — DDR5 Registered DIMM Design File ............................................................................................... 1

Table 2 — Module Configuration ................................................................................................

........................ 1

Table 3 — SDRAM Configuration ...................................................................................................................... 2

Table 4 — Supported Speeds ............................................................................................................................... 2

Table 5 — Design Deviations .............................................................................................................................. 2

Table 6 — SMBus Net Structures ........................................................................................................................ 8

Table 7 — Clock Lengths for Register Input Net Structures ............................................................................... 8

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JEDEC